21101101326 has 12 divisors (see below), whose sum is σ = 45719052912. Its totient is φ = 7033700436.

The previous prime is 21101101321. The next prime is 21101101327. The reversal of 21101101326 is 62310110112.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1172283407 = 21101101326 / (2 + 1 + 1 + 0 + 1 + 1 + 0 + 1 + 3 + 2 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 21101101299 and 21101101308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101101321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586141686 + ... + 586141721.

It is an arithmetic number, because the mean of its divisors is an integer number (3809921076).

Almost surely, 2^21101101326 is an apocalyptic number.

21101101326 is an abundant number, since it is smaller than the sum of its proper divisors (24617951586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21101101326 is a wasteful number, since it uses less digits than its factorization.

21101101326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172283415 (or 1172283412 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21101101326 its reverse (62310110112), we get a palindrome (83411211438).

The spelling of 21101101326 in words is "twenty-one billion, one hundred one million, one hundred one thousand, three hundred twenty-six".